Downloader Aria2 android app configuration

Hello , i'm new to this forum and to OMV too.I've just installed on mi rpi 3 the last release of omv 2 stable.
Searching for an "internet download manager" alternative in omv i found the plugin downloader and i've installed.
Works fine but i 've a problem. I want to access to aria 2 from my android app but i cant configure it .
It's possible??
the json rpc interface is enabled ??I need to know which is the port , the default 6800 seems doesn't work.